Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0234ae248ceca3…

MALICIOUS

PDF

87.5 KB Created: 2021-08-08 19:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c08f3610c4451ef328b4080b9b25c13b SHA-1: 907c0ab085fefc4029f820e31468196ca324a34d SHA-256: 4f0234ae248ceca3524963ee21e9decdb5332e0aa4a8e93e4d8b464fd510fbec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=philadelphia+mafia+family+tree PDF link annotation
    • https://ckmusicdesign.nluserfiles/file/38822886576.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9b1500c9---pakabezogokidibadiw.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zepodulasuta.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nabatuwemimu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/19fa92b22147e417dc60ee712845a16b/fuguzupa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f8cfc3d45---vonuwuxirisezosuxosu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/95956770444.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/wukagojilisutop.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19699431543.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ec4de73693a6a23e608be756a77d8ba4/winosojidatopipiriti.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607208c29eb30---88202391889.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/57299703907.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jipukofumirejumamejuv.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n88d1vjg4sn6duk9k07eac1b50/32246310686.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41832916145.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/sujixamanoredujipekin.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b5e88416d---rugalibefowaduvil.pdfIn PDF document text
    • https://renault-service.com/userfiles/nuzokoso.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b618672ca2b---batumipalezuvoliwa.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bcfd837b---42066978479.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8fc34b13---45916767472.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/30375702717.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/nadozanewaxirori.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051811554166.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/fugavakumijimusi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c7320a09---91160915804.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 10484 bytes
SHA-256: ad5430b954b530b3de17ea05afe0dff10f601cd0300e2cca4b09a79db4873ef7
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16840 bytes
SHA-256: 188cfe41ae5e5e763d31bf564c11a08f6e1e8eb8260f47990b2a271c78dff1e6

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